| Asteroid Number | 11 | | Asteroid Group | Main Asteroid Belt | | Asteroid Family | Not applicable | | Composition Class | S-type (silicaceous / stony) | | Orbital Period | 3 years, 307 days | | Distance from the Sun | Semi-Major Axis: 366,973,900 km (2.45 AU)
Perihelion: 330,490,300 km (2.21 AU)
Aphelion: 403,457,500 km (2.70 AU) | | Eccentricity | 0.0994 | | Diameter (Mean) | 149 km | | Notes | A dense stony asteroid with a mean diameter of approximately 150 kilometres, Parthenope has a broadly spherical shape, but with many irregularities and indentations in its form. Among the most massive asteroids, Parthenope's gravity can affect the orbits of other less massive bodies, notably the asteroid Thetis, and these gravitational effects allow Parthenope's mass to be calculated with considerable accuracy. |
Although it is one of the most massive asteroids, with a diameter of more than 150 km, Parthenope is quite invisible to the naked eye. It circles the Sun at a little under 2½ AU, a journey it takes nearly four years to complete.
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